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8-7.
AUDIO SYSTEM ADJUSTMENT
•
Use a color
bar
signal as
input
video signal
for
adjustment.
[Connection
of Audio MeHuring Devices]
Besides video measuring devices, connect audio
measuring
devices
as shown in the figure
below,
and
perform the adjustment in input select switch LINE
position.
Audio
oscillator
Audio
level
meter
or
distortion
meter
,...........__..,
47'2
AUDIO OUT
terminal
Tested
unit
Fig.
8-46.
8·7·1. AFM Audio System Check
1.
AFM
carrier
frequency
check
(SV-35 board)
Mode
Recording (SP mode)
Signal
Non-signal
Pin
®
of lilCOOl
Measurement Point
(REC
AFM
RF)
Measuring
Instrument Frequency
counter
Specified
Value
1.50
±
0.01 MHz
Checking
method
:
1)
Tum the audio oscillator output
off.
2) Confirm
that
AFM carrier frequency is 1.50
±
O.ot
MHz.
2.
AFM deviation check
Mode
Playback
Signal
Alignment
tape
for operation
check
(WR5-3CSP)
Measurement Point
AUDIO OUT terminal
Measuring Instrument
Audio level
meter
Specified Value
-
10±2dBs
Checking method :
1)
Confirm
that
audio output
level
is -
10
± 2
dBs.
3.
E·E output level check
Mode
E-E
Signal
400 Hz, -
10
dBs
Measurement
Point
AUDIO OUT terminal
Measuring Instrument Audio
level meter
Specified Value
-
10
±
2 dBs
Checking method
:
1)
Confirm
that audio
output level is
-
10
±
2
dBs.
o4.
Overall level characteristic check
Mode
Self-recording and playback
Signal
400 Hz, - 10
dBs
Measurement
Point
AUDIO OUT terminal
Measuring Instrument Audio
level meter
Specified Value
-
10±2dBs
Checking
method
:
1)
Record
the
signal.
2)
Play back the recorded section.
3)
Confirm
that
audio output
level
is
- 10
±
2 dBs.
-
170
-
~
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